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A self-standing adhesive-free flexible sio 2 Preparation methods and applications of @c composite materials

A self-supporting, negative electrode material technology, applied in the direction of structural parts, active material electrodes, electrical components, etc., to achieve the effect of easy electron transmission, small size, and good crystallinity

Active Publication Date: 2022-06-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a self-supporting adhesive-free flexible SiO 2 Preparation method and application of @C composite materials to relieve SiO 2 Large volume changes during charge and discharge, poor conductivity, and poor electrode stability

Method used

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  • A self-standing adhesive-free flexible sio <sub>2</sub> Preparation methods and applications of @c composite materials
  • A self-standing adhesive-free flexible sio <sub>2</sub> Preparation methods and applications of @c composite materials
  • A self-standing adhesive-free flexible sio <sub>2</sub> Preparation methods and applications of @c composite materials

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preparation example Construction

[0018] The invention provides a free-standing flexible SiO without binder 2 The preparation method and application of the @C composite material, including the following steps:

[0019] S1. Acidizing treatment of carbon cloth;

[0020] The carbon cloth was pretreated, and the carbon cloth was cut into cubes of 3cm×3cm×0.1cm, soaked in a hydrochloric acid solution with a concentration of 1mol / L for 12 hours, and then washed alternately with deionized water and ethanol for 3 times at 60°C. Drying to obtain acidified carbon cloth A;

[0021] S2, the preparation of precursor solution;

[0022] Mix 0.1~0.5mL ethyl orthosilicate (TEOS) with 10~60ml deionized water, and stir for 1~2 hours to obtain solution B; mix solution B with 0.05~0.2ml 25% ammonia water and stir for 1~ Solution C was obtained after 2 hours;

[0023] S3. Free-standing flexible SiO without binder 2 Preparation of @C Composites

[0024] Put the carbon cloth A and the solution C into the reaction kettle togethe...

Embodiment 1

[0031] S1. Acidizing treatment of carbon cloth;

[0032] The carbon cloth was pretreated, and the carbon cloth was cut into cubes of 3cm × 3cm × 0.1cm, soaked in a hydrochloric acid solution with a concentration of 1mol / L for 12 hours, and then washed with deionized water and ethanol alternately for 3 times at 60°C. After drying, acidified carbon cloth A is obtained;

[0033] S2, the preparation of precursor solution;

[0034] Mix 0.1 mL of tetraethyl orthosilicate (TEOS) and 10 mL of deionized water, and stir for 1 hour to obtain solution B; mix solution B with 0.05 mL of 25% ammonia water and stir for 1 hour to obtain solution C;

[0035] S3. Free-standing flexible SiO without binder 2 Preparation of @C Composites

[0036] Put the carbon cloth A and the solution C into the reactor together, and react at 180 ° C for 10 hours; after the reaction, take out the carbon cloth, wash it with water and alcohol three times, and then dry it at 80 ° C to obtain a self-supporting non-...

Embodiment 2

[0042] S1. Acidizing treatment of carbon cloth;

[0043]The carbon cloth was pretreated, and the carbon cloth was cut into cubes of 3cm × 3cm × 0.1cm, soaked in a hydrochloric acid solution with a concentration of 1mol / L for 12 hours, and then washed with deionized water and ethanol alternately for 3 times at 60°C. After drying, acidified carbon cloth A is obtained;

[0044] S2, the preparation of precursor solution;

[0045] Mix 0.53 mL of tetraethyl orthosilicate (TEOS) and 40 mL of deionized water, and stir for 2 hours to obtain solution B; mix solution B with 0.15 mL of 25% ammonia, and stir for 1 hour to obtain solution C;

[0046] S3. Free-standing flexible SiO without binder 2 Preparation of @C Composites

[0047] Put the carbon cloth A and the solution C into the reaction kettle together, and react at 200 ° C for 10 hours; after the reaction, take out the carbon cloth, wash it with water and alcohol three times, and then dry it at 80 ° C to obtain a self-supporting ...

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Abstract

The invention discloses a self-supporting flexible SiO without binder 2 Preparation method and application of @C composite materials, using a one-step hydrothermal method to prepare free-standing binder-free flexible SiO 2 @C composite material, the synthesis process is simple and easy to operate. Moreover, carbon cloth is selected as the carbon substrate, and the material is cheap and easy to obtain. In addition, nanoscale SiO 2 There are more lithium ion contact sites on the particle surface, which can fully react with lithium, and the carbon cloth acts as SiO 2 The particle carrier makes the nanoparticles evenly distributed on the surface of the carbon fiber, which solves the problem that the nanoparticles are easy to agglomerate, and the carbon fiber can form a conductive carbon fiber network, which is easy to transmit electrons, making the electrons unimpeded on the entire flexible substrate.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a self-supporting binder-free flexible SiO 2 Preparation methods and applications of @C composites. Background technique [0002] With the rapid development of portable devices, such as mobile phones and notebook computers, people are increasingly demanding high-capacity and high-energy-density lithium-ion batteries. However, the reversible capacity of graphite anodes in Li-ion batteries is only ~372 mA hg -1 . Unfortunately, it is extremely difficult to use lithium metal as a battery material anode because dendrites easily form on the surface of the lithium anode. In recent years, researchers have shown great interest in developing new high-capacity anode materials such as alloys and carbon-based composites. It is well known that some elements can electrochemically react with lithium to form lithium alloys and produce high capacities. Among these e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/62H01M10/0525
CPCH01M4/483H01M4/628H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 杨艳玲孙瑜侯小江陈志刚朱建锋邹鑫鑫陈华军锁国权毕雅欣和茹梅冯雷叶晓慧张荔
Owner SHAANXI UNIV OF SCI & TECH
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